1 /* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */ 2 /* 3 * Copyright(c) 2020 Intel Corporation. 4 * 5 */ 6 7 #ifndef HFI1_NETDEV_H 8 #define HFI1_NETDEV_H 9 10 #include "hfi.h" 11 12 #include <linux/netdevice.h> 13 #include <linux/xarray.h> 14 15 /** 16 * struct hfi1_netdev_rxq - Receive Queue for HFI 17 * IPoIB netdevices will be working on the rx abstraction. 18 * @napi: napi object 19 * @rx: ptr to netdev_rx 20 * @rcd: ptr to receive context data 21 */ 22 struct hfi1_netdev_rxq { 23 struct napi_struct napi; 24 struct hfi1_netdev_rx *rx; 25 struct hfi1_ctxtdata *rcd; 26 }; 27 28 #define HFI1_MAX_NETDEV_CTXTS 8 29 30 /* Number of NETDEV RSM entries */ 31 #define NUM_NETDEV_MAP_ENTRIES HFI1_MAX_NETDEV_CTXTS 32 33 /** 34 * struct hfi1_netdev_rx: data required to setup and run HFI netdev. 35 * @rx_napi: the dummy netdevice to support "polling" the receive contexts 36 * @dd: hfi1_devdata 37 * @rxq: pointer to dummy netdev receive queues. 38 * @num_rx_q: number of receive queues 39 * @rmt_index: first free index in RMT Array 40 * @msix_start: first free MSI-X interrupt vector. 41 * @dev_tbl: netdev table for unique identifier IPoIb VLANs. 42 * @enabled: atomic counter of netdevs enabling receive queues. 43 * When 0 NAPI will be disabled. 44 * @netdevs: atomic counter of netdevs using dummy netdev. 45 * When 0 receive queues will be freed. 46 */ 47 struct hfi1_netdev_rx { 48 struct net_device *rx_napi; 49 struct hfi1_devdata *dd; 50 struct hfi1_netdev_rxq *rxq; 51 int num_rx_q; 52 int rmt_start; 53 struct xarray dev_tbl; 54 /* count of enabled napi polls */ 55 atomic_t enabled; 56 /* count of netdevs on top */ 57 atomic_t netdevs; 58 }; 59 60 static inline 61 int hfi1_netdev_ctxt_count(struct hfi1_devdata *dd) 62 { 63 return dd->netdev_rx->num_rx_q; 64 } 65 66 static inline 67 struct hfi1_ctxtdata *hfi1_netdev_get_ctxt(struct hfi1_devdata *dd, int ctxt) 68 { 69 return dd->netdev_rx->rxq[ctxt].rcd; 70 } 71 72 static inline 73 int hfi1_netdev_get_free_rmt_idx(struct hfi1_devdata *dd) 74 { 75 return dd->netdev_rx->rmt_start; 76 } 77 78 static inline 79 void hfi1_netdev_set_free_rmt_idx(struct hfi1_devdata *dd, int rmt_idx) 80 { 81 dd->netdev_rx->rmt_start = rmt_idx; 82 } 83 84 u32 hfi1_num_netdev_contexts(struct hfi1_devdata *dd, u32 available_contexts, 85 struct cpumask *cpu_mask); 86 87 void hfi1_netdev_enable_queues(struct hfi1_devdata *dd); 88 void hfi1_netdev_disable_queues(struct hfi1_devdata *dd); 89 int hfi1_netdev_rx_init(struct hfi1_devdata *dd); 90 int hfi1_netdev_rx_destroy(struct hfi1_devdata *dd); 91 int hfi1_alloc_rx(struct hfi1_devdata *dd); 92 void hfi1_free_rx(struct hfi1_devdata *dd); 93 int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data); 94 void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id); 95 void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id); 96 void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id); 97 98 /* chip.c */ 99 int hfi1_netdev_rx_napi(struct napi_struct *napi, int budget); 100 101 #endif /* HFI1_NETDEV_H */ 102